/Engine/Source/Runtime/ApplicationCore/Public/GenericPlatform/ITextInputMethodSystem.h
Measures the screen-space bounds of the text in the specified range of code points.
True if the specified range of code points is drawn clipped. False otherwise.
bool GetTextBounds ( const uint32 InBeginIndex, const uint32 InLength, FVector2D & OutPosition, FVector2D & OutSize )